Address is listed as Street Name, Lot #, Desirable City, State + ZipSomething about the plat seemed off to me and I discovered a calculation error and that it was actually 1.02 acres.

They had no common sense what so ever.  

The amounts of square footage cover is so low the delta becomes a rounding error. 

Some must be using PriceLabs because it’s so common. 

Start by reviewing the assessment report for errors, such as incorrect square footage or outdated property features.

I bought the book also & the link leading me to Biggerpockets does not work either & gives me the same error!

It's just common sense, but not really scalable as a business of its own IMO.   1.)

Here's a https://www.irs.gov/businesses/cost-segregation-audit-technique-guide-chapter-4-principal-elements-of-a-quality-cost-segregation-study-and-report to the IRS website noting specific items that are included in the cost segregation study report. hmm, that website is a 404 error.  

Several factors indicate the company is not that concerned about efficiency or ease of customer process: the website, a process that seemed to focus on one issue at a time instead of all issues at once, and consistently poor communications and lack of common sense from the loan analyst we were assigned.It started off very well with the initial point of contact, Austin Lornson, who did a fine job of explaining the general refinancing process, responding quickly and thoroughly to our questions.

You need to review the assessment record for your property as there may be errors.